Take you step by step to understand the implementation method of changing password in php ajax

With the continuous development of Internet technology, we are increasingly using various applications, and these applications require login accounts to protect our privacy and security. For these applications, changing passwords is one of the most common operations we usually perform. In this process, we usually choose to use php and ajax for implementation. Next, let’s learn step by step how to implement PHP ajax password change.

1. Front-end page design

First, we need to design a front-end page to provide the function of changing passwords. In this front-end page, we need to enter the current password, new password, confirm new password and other information, so a form is needed. The form needs to be submitted to the background for processing, so we also need to use a button, such as the "Submit" button to submit the form.

2. PHP background processing

Next, we need to use PHP background to process this form. The first thing to note is that the front-end page should send a post request to the php backend to submit the form to the backend. To receive the passed form data in php, you need to use the $_POST array:

$old_password = $_POST['old_password'];
$new_password = $_POST['new_password'];
$confirm_password = $_POST['confirm_password'];

Next, we need to perform some business logic processing. First, you need to check whether the current password is correct:

if (!password_verify($old_password, $user['password'])) {
    echo '当前密码错误，请重新输入。';
    exit;
}

The password_verify() function is used here to verify whether the current password is correct. If the current password is entered incorrectly, the page needs to prompt the user to re-enter it.

Next, you need to check whether the new passwords entered twice are consistent:

if ($new_password !== $confirm_password) {
    echo '两次输入的新密码不一致，请重新输入。';
    exit;
}

If the new passwords entered twice are inconsistent, the user needs to be prompted to re-enter.

It should be noted that for security reasons, we need to use password hashes to store user passwords. Here, use the password_hash() function to hash the new password:

$password_hashed = password_hash($new_password, PASSWORD_DEFAULT);

Finally, use the sql statement to perform the database update operation:

$sql = "UPDATE users SET password = :password WHERE id = :id";
$stmt = $db->prepare($sql);
$stmt->bindParam(':password', $password_hashed, PDO::PARAM_STR);
$stmt->bindParam(':id', $user['id'], PDO::PARAM_INT);
$stmt->execute();

After the above operation is completed, the page needs to prompt the user to change the password success.

3. Ajax asynchronous submission

The last step is to use ajax to submit the front-end page asynchronously. Asynchronous commits generally provide a better user experience than synchronous commits. Asynchronous submission will only refresh partially and will not cause the entire page to be refreshed. Here we use jquery's $.ajax() method to implement asynchronous submission:

$.ajax({
    type: 'POST',
    url: 'update_password.php',
    data: $('#form').serialize(),
    dataType: 'json',
    success: function (data) {
        if (data.success) {
            alert('修改密码成功');
            window.location.href = 'index.php';
        } else {
            alert(data.message);
        }
    },
    error: function () {
        alert('修改密码失败，请重试！');
    }
});

The above is the implementation method of changing the password in php ajax. It connects front-end page design, PHP background processing and ajax asynchronous submission to realize the operation of changing passwords.

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